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Perl 5.8 Documentation - perldsc - Perl Data Structures Cookbook

http://perl.active-venture.com/pod/perldsc.html

Perldsc - Perl Data Structures Cookbook. The single feature most sorely lacking in the Perl programming language prior to its 5.0 release was complex data structures. Even without direct language support, some valiant programmers did manage to emulate them, but it was hard work and not for the faint of heart. You could occasionally get away with the. Notation borrowed from awk. In which the keys are actually more like a single concatenated string. How do you print it out? Why can't you say just. As you s...

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Perl 5.8 Documentation - perlbot - Bag'o Object Tricks (the BOT)

http://perl.active-venture.com/pod/perlbot.html

Perlbot - Bag'o Object Tricks (the BOT). The Perl motto still holds: There's more than one way to do it. Do not attempt to verify the type of $self. That'll break if the class is inherited, when the type of $self is valid but its package isn't what you expect. See rule 5. Use the two-argument form of bless(). Let a subclass use your constructor. See INHERITING A CONSTRUCTOR. The subclass is allowed to know things about its immediate superclass, the superclass is allowed to know nothing about a subclass.

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Perl 5.8 Documentation - perltooc - Tom's OO Tutorial for Class Data in Perl

http://perl.active-venture.com/pod/perltooc.html

Perltooc - Tom's OO Tutorial for Class Data in Perl. When designing an object class, you are sometimes faced with the situation of wanting common state shared by all objects of that class. Such class attributes. Act somewhat like global variables for the entire class, but unlike program-wide globals, class attributes have meaning only to the class itself. Here are a few examples where class attributes might come in handy:. To keep a count of the objects you've created, or how many are still extant. You s...

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Perl 5.8 Documentation - perlreftut

http://perl.active-venture.com/pod/perlreftut.html

Perlreftut - Mark's very short tutorial about references. Fortunately, you only need to know 10% of what's in the main page to get 90% of the benefit. This page will show you that 10%. Who Needs Complicated Data Structures? One problem that came up all the time in Perl 4 was how to represent a hash whose values were lists. Perl 4 had hashes, of course, but the values had to be scalars; they couldn't be lists. Why would you want a hash of lists? A reference is a scalar value that refers to. You can't have...

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Perl 5.8 Documentation - perlfaq3 - Programming Tools

http://perl.active-venture.com/pod/perlfaq3.html

Perlfaq3 - Programming Tools. This section of the FAQ answers questions related to programmer tools and programming support. How do I do (anything)? Have you looked at CPAN (see perlfaq2. The chances are that someone has already written a module that can solve your problem. Have you read the appropriate manpages? Here's a brief index:. A crude table of contents for the Perl manpage set is found in perltoc. How can I use Perl interactively? Is there a Perl shell? Which includes the following description:.

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Perl 5.8 Documentation - perllol - Manipulating Arrays of Arrays in Perl

http://perl.active-venture.com/pod/perllol.html

Perllol - Manipulating Arrays of Arrays in Perl. Declaration and Access of Arrays of Arrays. The simplest thing to build is an array of arrays (sometimes imprecisely called a list of lists). It's reasonably easy to understand, and almost everything that applies here will also be applicable later on with the fancier data structures. An array of an array is just a regular old array @AoA that you can get at with two subscripts, like. Here's a declaration of the array:. AoA[2][2] $ref to AoA- [2][2]. AoA[2]-...

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Perl 5.8 Documentation - perlstyle - Perl style guide

http://perl.active-venture.com/pod/perlstyle.html

Perlstyle - Perl style guide. Each programmer will, of course, have his or her own preferences in regards to formatting, but there are some general guidelines that will make your programs easier to read, understand, and maintain. The most important thing is to run your programs under the -w. Flag at all times. You may turn it off explicitly for particular portions of code via the. Variable if you must. You should also always run under. Or know the reason why not. The. Pragmas may also prove useful. Larry...

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Perl 5.8 Documentation - perldebtut - Perl debugging tutorial

http://perl.active-venture.com/pod/perldebtut.html

Perldebtut - Perl debugging tutorial. A (very) lightweight introduction in the use of the perl debugger, and a pointer to existing, deeper sources of information on the subject of debugging perl programs. There's an extraordinary number of people out there who don't appear to know anything about using the perl debugger, though they use the language every day. This is for them. Usr/bin/perl $var1 = 'Hello World'; # always wanted to do that :-) $var2 = $varl n; print $var2; exit;. And to fix this we declar...

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